Pressure under a solid
3 marks · NormalA man stands on one foot. His mass is 72 kg. The area of the sole of his foot is 0.032 m^2. Calculate the pressure he exerts on the floor. Take g = 10 N/kg.
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22,500 Pa (±100)
Common mistakes: Forgetting to convert kg to N; Incorrectly using mass as force
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Marking points
M1 · 1 mark · Calculates weight using W = mg.
M2 · 1 mark · Substitutes into p = F / A. (follow-through)
A1 · 1 mark · Correct answer with appropriate units. (follow-through)
Worked solution
Weight = 72 kg × 10 N/kg = 720 N
Pressure = 720 N / 0.032 m^2 = 22,500 Pa